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Property and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment consists of the following (in thousands):
 
December 31,
 
2017
 
2016
Furniture and fixtures
$
1,735

 
$
2,124

Computer hardware and software
1,213

 
1,228

Machinery and equipment
4,274

 
11,078

Vehicles
—

 
31

 
7,222

 
14,461

Less accumulated depreciation
(6,508
)
 
(13,303
)
 
$
714

 
$
1,158


Depreciation expense was $0.2 million and $0.3 million for the years ended December 31, 2017 and 2016, respectively.